by Swift2568
I had to pull some of the parts into Meshmixer to cut out space for the sphere. Then I designed a custom plug to fit into the back part that would hold the tab on the sphere tightly so I could control orientation. I also took the time to adjust some of how the rear is put together so I could print the engine in a different color than the engine cowl.
Here are the spheres I used. I grabbed a mixed set so I could try a few different sizes.
https://www.amazon.com/gp/product/B0776NHB88